Lock for sliding doors.



H. G. VOIGHT.

LOOK FOR SLIDING DOORS.

APPLICATION FILED MAR.2,1912.

1,040,967, Patented Oct. 8, 1912.

2 SHEETS-SHEET 1.

WITNESSES i INVENTOH BY Jim wh v H. G. VOIGHT.

LOCK FOR SLIDING DOORS.

APPLICATION FILED MAR. 2, 1912.

Patented Oct. 8, 1912.

2 SHEETSSHBET 2.

INVENTOR 6. 76/0/17 COLUMBIA PLANOGRAPH CO.. WASHINGTON, D. c

HENRY G. VOIG'I-I'I, OF NEW BRITAIN, CONNECTICUT.

LOOK FOR SLIDING DOORS.

Specification of Letters Patent.

Patented Oct. 8, 1912.

Application filed March 2, 1912. Serial No. 681,254.

To all whom it may concern:

Be it known that I, HENRY G. VOIGHT, a citizen of the United States, residing at New Britain, county of Hartford, State of Connecticut, have invented certain new and useful Improvements in Looks for Sliding Doors, of which the following is a full, clear.- and exact description.

This invention relates to looks for sliding doors, and is more particularly directed to the provision, in connection with door locking devices releasable from one side of the door only, of means cooperating with the locking devices to permit the normal operation thereof, but which may be manipulated, when desired, to render the locking device inoperative and to permit the door being closed without looking, so that it can be opened from the opposite side. A specific application of such a device is seen in the case of elevator casing doors. These doors usually look from the inside and such a lock may only be released from the inside to open the door. There are times when an elevator operator finds it necessary to leave his car at a door entrance and the use of my device will enable him to do this and close the door, so that it may be opened from the exterior of the car. Upon reentering, the device may be positioned to restore the normal locking function of the door locking device.

An embodiment of my invention as applied to a specific form of door operating and locking means, is illustrated in the accompanying drawings, in which- Figure *1 is a view in elevation of a sliding door locking and operating means embodying my invention. Fig. 2 is a view in side elevation of the locking device shown in Fig. 1, in door locking position, the device of my invention being shown in full lines as positioned to lock the door, and in dotted lines in look inoperative position. Fig. 3 is a vertical, section on the line 33 Fig. 2. Fig. 4 is a view in elevation of a modified form. Fig. 5 is a section on the line 55 of Fig. 4.

In the drawings, I have illustrated my device as applied to door locking and operating mechanism of the type forming the subject-matter of my co-pending application Serial No. 681,253. This mechanism comprises a closer cylinder secured to a door casing, a pair of pivotally connected levers forming a toggle, one being pivoted to the door casing and connected to and actuated by the closer cylinder, and the other being pivoted to the forward edge of the door. This last named lever member carries at its forward end a segmental plate concentrically pivoted therewith and adjustably secured at its free end to the lever member and oscillating with the swinging movement of said lever as the door is opened or closed. A locking lever is pivotally mounted on the door and carries an arm adapted to swing in an arc intercepted by the arcuate edge of the segmental plate. This arm carries cheek plates, which guide the arm upon the edges of the segment. The arcuate edge of this segment is so positioned relative to this arm that when the door closes the oscillation given to the segment through its lever by this closing movement will swing its arouate edge beyond the arc of movement of the locking lever arm. This arm is then thrown by a spring past this arcuate edge of the segment and abuts against one of its sides in the path of door-opening movement of the segment, thereby lockingthe door against opening movement. The edge of the segment against which the arm abuts cooperates with this arm to permit its being independently moved by the locking lever beyond the path of door opening movement of the segment, a continued movement of the locking lever bringing it against an abutment carried by the door operating lever and opening the door. The application of my invention to such a locking device permits the normal locking action of the arm to take place, but provides means whereby the locking arm may be moved, when desired, from looking position.

Referring to the drawings by numerals, 1 indicates the door casing forming, for instance, part of an elevator well and acting as a stationary abutment, 2 a sliding door, 3 a bracket secured to the casing, 4 a closer cylinder pivoted at its lower end to the lower end of the bracket, 5 and 6 lever members pivoted together at their adjoining ends and forming a toggle, the lever 5 being pivoted at its other end to the upper portion of the bracket 3 and having a transverse arm 7 adjacent said end connected to the piston rod 8 of the closer cylinder. The lever member 6 is composed of two spaced bars 6 pivotally mounted at their forward ends upon a lower door plate 10 by means of the headed stud or bolt 11 having a threaded inner end engaged with a nut 12 seated in a countersunk recess in the rear face of the door plate 10. In order to guide the levers and prevent them from sagging, a guide 9 is provided secured to the rear edge of the door and inclosing the spaced bars 6 forming the lever member 6. At their forward ends the bars 6 inclose bet-ween them a segmental plate 13, which, at its forward end, is pivotally mounted upon the door with said bars by means of the headed stud 11. The lower edge of this plate extends rearwardly between these bars and is adjustably secured thereto by means of the bolt 14 engaging through the slot 15 in the plate and clamping the same to the bars by means of the nut 16 engaging the outer end of the bolt. This nut likewise clamps to the outermost bar 6* one end of a guide bar 17, which is spaced from said bar 6' and at its forward end is riveted to the extended end of said bar at 18.

A second door plate 19 is positioned above the lower door plate 10, and is provided with hub 20, provided with an annular recess 21 surrounding a central stud 22, which projects beyond the hub portion 20 and has its outer end threaded. A. coiled spring 23 is seated within the annular recess 21, its inner end engaging the rear of the hub and its outer end secured to a lever 24 pivotally mounted on the end of the stud 22 and held thereto by any suitable means, as a nut engaging the outer end of said stud. Adjacent its inner end, the hub 20 is formed with an annular external shoulder 25. Upon the hub, between its annular shoulder at the end of lever 24, is journaled a sleeve 26, formed on the end of a locking arm 27, which ordinarily forms an arm of the lever 24, but is adapted for free swinging movement relatively thereto. The outer end of this arm 27 is formed with a curve 28, whose arc has the hub 20 for its center. At the curved end of this arm and extending from either face thereof are cheek plates 29, which project beyond the end and also side of the arm. The segmental plate 18 has an arcuate edge l8 formed on its pivot stud 11 as a center and has its side edge at the point of junction with said arcuate edge, cut away or recessed at 13", the curvature of this portion corresponding to the arc of the curve upon the outer end 28 of arm 27. Through suitable means, which I will shortly describe, this arm 27 is adapted to be fixedly positioned relative to the lever 24, and in this fixed position, when the door is open, the end of arm 27 rides over the arcuate edge 13 of the segamental plate, its cheek plates 29 giiiding upon the faces of the plate adjacent said arcuate edge. When the door closes, this plate, with its arcuate edge, is so positioned relative to the arm 27 that the movement imparted to the lever member 6 by the closing of the door, will oscillate the segmental plate 18, so that its arcuate edge will swing beyond the arc of movement of the outer end 28 of the arm 27, whereupon the coiled spring 23 will move the lever 24 and through it the arm 27 downwardly, the curved outer end 28 of this arm taking into the recess 13 in the side of the segmental plate. It is obvious that in this position the door cannot be opened, as such opening movement would oscillate the segmental plate 13 upwardly, and this is prevented by the end 28 of the arm abutting against the side of said segmental plate in the path of door-opening movement thereof, this plate therefore acting as a locking abutment. With the arm 27 in this fixed relation to lever 24, and the door being closed, in order to move the locking end 28 of arm 27 from contact with the segmental plate 13 and out of the path of door-opening movement thereof, it is only necessary to actuate the oifsethandle portion 14 of the lever 14 to move said lever and said arm from the position shown in Fig. 2, to the right. As the recessed or cutaway edge 13 of the segmental plate corresponds in curvature to that of the outer end 28 of the arm 27, and as the lever and its arm have a limited free movement relative to the segmental plate and its lever it is obvious that this can be effected without interference by the segmental plate 13. Between the guide bar 17 and the outermost lever bar 6, I prefer to secure a buffer stop 38 at one end of said guide bar and an antifriction roller 39 on the other end of said guide bar. The buffer stop 38 is designed to receive the impact of the lever 24 as it swings into door-locking position, and the antifriction roller 39 forms an abutment against which the lever 24 bears after its arm 29 has been moved out of the path of door-opening movement of the segmental plate 13. It will be obvious that a continued movement of the lever 24 after it reaches the antifriction roller, will break the toggle formed by the lever members 5 and 6 and open the door.

In order to hold the arm 27 of the lever 24 in fixed relation thereto, and at the same time to permit said arm to be retracted from segment-engaging position, so that the door may be closed without being locked, I provide the following instrumentalities: Referring particularly to Figs. 1, 2 and 3, it will be seen that I havepivotally secured to the under face of lever 24 one end of a link member 80, and that to the end of arm 27 recessed at 33 to cooperate with and receive this pin 31 when the links are straightened out in longitudinal alinement. Referring specifically to Fig. 2 of the drawings, it will be seen that when these links are in longitudinal alinearent, the arm 27 is positioned for locking engagement with the segmental plate 13, and by reason of the lock formed by the lock pin 32 and notch 33 is fixedly maintained in such position. If it is desired, however, to retract the arm 27 from looking position, it is only necessary to exert pressure upon the links 30-31 at their point of overlap to break their longitudinal alinement, this action causing the links to fold together, as shown in dotted lines in Fig. 2, and permitting the arm 27 to swing downwardly by gravity to the position likewise indicated in dotted lines in the same figure. It will be evident that in order to again fixedly position the arm 27 relative to the lever 24, it is only necessary to move this arm outwardly, whereupon the links 30--31 will unfold and resume their position of longitudinal alinement with the pin 32 locked in the notch 33. In Figs. 4 and 5 of the drawings, I have shown a modification of this means for positioning the door-locking arm 27. This is accomplished by providing a single link 34 pivoted at its outer end to the end of arm 2-7 and having at its inner end an offset portion 35 extending therefrom at approximately a right angle. The link is formed with a longitudinally extending slot 34, which is likewise formed with an offset or annular extension 35 corresponding to the offset 35 of the link. A headed stud or bolt 36 is inserted from the rear of said link through the slot therein and through an aperture provided in the lever 24, and is clamped against said lever and link by means of a thumb nut 37 engaging the threaded outer end of the stud 36. From an inspection of Fig. 4, it will be seen that when it is desired to fixedly position the arm 27 in door-locking position, the thumb nut 37 is loosened and the arm 27 and link 34 moved outwardly until the angular extension 35 of the slot in said link drops downwardly to engage with the shank of the stud with the adjacent edge of the offset portion 35 bearing against said stud and preventing any retractile movement of the arm and link when the thumb nut 37 has been tightened. \Vhen it is desired to retract the arm 27 fro n locking position, it is only necessary to loosen the thumb nut 37 and move the inner end of the link 34 upwardly until the shank of the stud 36 is brought into the longitudinally extended slot 34 whereupon the arm 27 may be swung inwardly to the position indicated in dotted lines in Fig. 4, the link 34 moving inwardly and downwardly with its longitudinal slot guided upon the shank of the stud 36. lVhen the arm 27 is moved outwardly to door-locking position, the reverse operation takes place, the link 34 moving upwardly until the angular portion 35 of the slot swings over and drops down against the shank of the stud 36, whereupon the thumb nut 37 is tightened, as hereinbefore described.

While I have described this locking and unlocking device as applied to a specific form of door lock, it is obvious that it may be adapted to various other forms and may itself be modified within the spirit of my invention and the appended claims.

WVhat I claim is:

1. In a device of the character described, the combination of a door casing, a sliding door, a lever pivoted to said door and connectedto said casing and swinging with the opening and closing movement of said door, a member carried by and oscillating with the movement of said lever, a member pivotally mounted on said door and carrying a part adapted to engage said oscillating member as said door closes and lock said door against opening movement, means whereby said member may be withdrawn from looking engagement and whereby said door may be opened, and means whereby said locking member may be inoperatively positioned relative to said oscillating member to permit the door to close without locking.

2. In a device of the character described, a sliding door, a movable arm carried thereby, a connection for said arm independent of the door, an operating handle carried by the door, a locking device operable by said handle and coacting with said arm to hold said arm against movement and to thereby lock said door, and means whereby said lock- 105 ing device may be inoperatively positioned relative to said arm to permit the door to close without looking.

3. In a device of the character described,

a sliding door, a movable lever carried there- 110 by, a connection for said lever independent of the door, an operating handle carried by the door, a locking device operable by said handle and coacting with said lever to hold said lever against movement and to thereby 115 lock said door, closing mechanism for said door operatively connected with said lever to move the latter in a direction to move said door into closed position, and means whereby said locking device may be inoper- 12o atively positioned relative to said lever to permit the door to close without locking.

4. In a device of the character described,

a sliding door, an arm pivotally mounted near one end on said door, a support or con- 125 nection independent of the door for the other end of said arm, said arm being movable relatively to said door and to said independent support, an operating handle carried by the door for moving the latter, said 130 handle having a limited independent movement relatively to said door, a locking mechanism for said arm to prevent movement thereof and to thereby lock the door, said locking mechanism being controllable by the said independent movement of said handle, and means for rendering said locking mechanism inoperative to lock said arm against movement.

5. In a device of the character described, a sliding door, a toggle lever connected at one end to said door, a cooperating toggle lever for the other end of the first mentioned toggle lever, a support for said second toggle lever, means for moving said toggle levers normally in a direction to transmit a closing movement to the door, and a locking mechanism carried by the door and coacting with said first mentioned toggle lever to hold the latter against movement when the door is closed, and a door-operating handle carried by the door and capable of limited independent movement relatively thereto, means of connection between said handle and said locking means whereby the latter may be released preparatory to opening the door, and means for rendering said locking means inoperative to hold said toggle lever against movement to permit the door to close without locking.

6. In a device of the character described, a sliding door, a movable arm carried thereby, a connection for said arm independent of the door, an abutment carried by said arm and moving therewith, a locking device adapted to be positioned to cooperate with said abutment upon the closing of the door to thereby lock said door against opening movement, and means whereby said locking device may be inoperatively positioned relative to said abutment to permit said door to close without locking.

7 In a device of the character described, a sliding door, a stationary abutment, an arm mounted on said door and connected to said abutment and moving with the closing and opening of the door, an abutment carried by said movable arm, an operating handle, a locking device cooperating with said abutment and movable relative to said handle, means for fixedly positioning said device relative to said handle whereby said device may cooperate with said abutment upon the closing of the door to lock said abutment and arm against door opening movement, and means whereby said locking device may be moved relative to said handle to inoperatively position it relative to said abutment whereby said door may close without locking.

8. In a device of the character described, a sliding door, a stationary abutment, a lever mounted on said door and operatively connected to said abutment and movable by the opening and closing of the door, a locking abutment carried by said lever, a locking member adapted to be positioned to cooperate with said abutment as the door closes to lock said door against opening movement, and means whereby said locking member may be inoperatively positioned relative to said abutment to permit said door to close without locking.

9. In a device of the character described, in combination, a stationary abutment, a sliding door, a lever mounted on the door and connected to said abutment and movable by the opening and closing of the door, a locking abutment carried by said lever and oscillating with the movement thereof, a pivoted operating lever, an arm adapted to be fixedly positioned relative thereto to engage said oscillating abutment as the door closes to thereby lock said lever against door opening movement, and means for moving said arm relative to said lever to assume inoperative position.

10. In a device of the character described,

in combination, a stationary abutment, a V

sliding door, a lever pivotally mounted on said door and connected to said abutment and movable by the opening and closing of the door, a locking abutment carried by said lever and oscillating with the movement thereof, a pivoted operating lever carried by the door, an arm movable relative thereto, connecting means between said operating lever and arm adapted to be actu ated to posit-ion said arm in a fixed angular relation to said operating lever whereby said arm may engage said oscillating abutment as the door closes to thereby lock said lever against door opening movement, and means whereby said connecting means may be actuated to move said arm from such fi xed angular position to inoperative position.

11. In a device of the character described, in combination, a door casing, a sliding door, a lever pivotally mounted on the door and swinging with the opening and closing movement thereof, a segment carried by said lever and oscillating with the movement thereof, a pivoted operating lever, an arm adapted to swing relative thereto, a link connection between said lever and arm adapted to be actuated to position said arm in a fixed angular relation to said lever whereby said arm may engage with said oscillating segment as the door closes to thereby lock the said lever against door opening movement, and means whereby said link connection may be actuated to retract said arm to inoperative position.

12. In a device of the character described, in combination, a stationary abutment, a sliding door, a lever pivotally mounted upon said door and. connected to said abutment to swing with the opening and closing of the door, a pivoted segment connected to said lever and oscillating with the movement thereof, a plvoted operating lever on sald door, an arm pivoted to said door llIlk con nections between said arm and said oper- A ating lever adapted to be actuated to fixedly position said arm relative to said lever in a definite angular relation whereby said arm may engage With said oscillating segment as the door closes to thereby lock said con- 10 nections against door-opening movement,

HENRY G. VOIGHT.

Witnesses:

GWENDOLINE A. JAoKsoN, M. S. WIARD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

